But the accusations, which date back seven years, only came to light last year – after Bahrain, Saudi Arabia, the UAE and Egypt cut links with Qatar.
The allies accused the emirate of supporting terrorist groups and of being too close to Iran – allegations the emirate has vigorously denied.
At the time, Wefaq said the allegations were an attempt by the Bahraini government to smear it and prolong the imprisonment of its leader, who has been in custody since 2015.
What happened in 2011?
Demonstrators – mainly led by the majority Shia community – took to the streets in February 2011, demanding more democracy as part of pro-democracy uprisings across the Arab world.
But the royal Al Khalifa family, who hold most of the political and military posts, managed to suppress the protests with the help of neighbouring countries, most importantly Saudi Arabia.
The unrest left at least 30 civilians and five policemen dead.
Ever since, the Sunni-ruled Bahrain has been wracked by unrest. In response, Bahrain – a key ally of the United States and the UK, which both have naval bases in the country – has outlawed opposition groups, while hundreds of government critics have been jailed.
BBC